About 15-18 years ago on the President Riverboat Casino in Davenport, Iowa. a $5 slot machine was 'malfunctioning' by paying off repeatedly in those big heavy clanky $5 tokens! It was quite funny actually, as this lady just kept spinning and kept hitting - it was putting out thousands before the Casino gods came down, let her keep what she had but shut down the machine.....she had quite a 'audience' watching this and I was one of them watching and wishing it was me that was raking in all the loot.....